Treadle-hammer.



UNITED STATES PATENT OFFICE.

TREADLE- HAMMER.v

Specification of Letters Patent.

Patented Nov. 21, 1905.

Application filed May 17, 1905. Serial No. 260.861.

To (ZZZ whom it may concern.-

Be it known that I, CARL MARTIN NIELSEN,

' of 3 Blaagaardsstraede, Roskilde, Denmark,

haveinvented certain new and useful Improvements Relating to Treadle-Hammers, of which the following is a specification.

This invention relates to treadle-hammers and its object is to rovide a novel and practical form of trea le-hammer wherein the hammer is returned to striking position by a special arrangement of springs after the blow has been delivered by depressing the treadle.

In my improved treadle-hammer the rear end of the hammer-arm is secured to a flat, or plate spring, the lower end of which is connected through the medium of links or rods, and a system of similar flat or late springs pivotally mounted in the under aming to another spring is in turn coupled by a strap or shackle fitted with an adjusting screw to a further spring movably connected at both ends to the underframing, so that the last-named springs can be brought nearer to or farther away'from each other by means of the adj Listing-screw, whereby the hammer can be raised to a greater or less extent, according to the blow to be delivered by depressing the treadle.

The invention will be understood from the following description of a typical form or example thereof and upon reference to the accompanying drawing, which illustrates the hammer mounted on asupporting-framing, one side of which is removed.

The underframing of the hammer consists of two side frames or, only one of which is shown, these frames being suitably stayed together and each provided at top with a bearing 1) for a shaft 0, about which the hammer-arm d swings.

To the rear of the hammer-arm is secured one end of a fiat or plate spring 6, similar in character to a carriage-s ring. This spring 6 is secured at right ang es to the hammerarm, and it is further connected to the hammer-arm at the other side of the shaft 0 by a metal strap j, fixed to its upper end. The lower end of the spring 6 is connected by a coupling-rod g to the lower end of a similar spring h, pivotal about a bolt i, mounted on the underframing a. This spring his fixed at top to a corresponding spring y, the lower end of which is connected by a rod k to a fourth spring Z of the same type as the others, the spring Z being also pivotal about a bolt m on the underframe. The spring Zis coupled at top by a strap or shackle n to a fifth spring 0, pivotally mounted on a bolt 1" in the underframe a, and the lower end of the spring 0 is connected to the front of the underframe by a link or member s. The shackle n does not bear direct against the spring 0, but is provided with a nut p, in which works an adjusting-screw g, fitted with a crank-handle. The screw 9 works against a bearing on the spring 0.

By screwing the adjusting screw 9 in against the spring 0 the springs Z and 0 are forced toward each other, and the resulting pull on the spring Z acts, through the described connection, as a pull on the spring 0, the lower end of which is thus somewhat raised, whereby the hammer is lifted to a higher striking position. On the other hand. by turning the screw q in the opposite direction in the nut p the hammer is lowered.

The blow is delivered in the known way by depressing a treadle t, pivoted on a shaft 1/.

and connected to the arm of the hammer by a link or rod 1), so that when the treadle is de pressed the hammer is forced down.

Various treadle -hammers have already been proposed in which the hammer is raised into the striking position by means of springs; but in many such hammers spiral springs connected to the rear end of the hammerarm are employed. These springs frequently have to be made in special factories and of special steel, and they are sometimes a source of considerable expense and are also very liable to become slack in use and cannot be renewed by the attendant when they break. Moreover, in some instances these springs exert a vertical pull downward on the hammer-arm, so that great friction is set up in the bearings of the hammer, this having the efiect of causing the hammer to work hard and subjecting it to heavy wear. These drawbacks are entirely overcome by the present arrangement forming the subject of the invention, thesprings of which practically never become slack and are not exposed to breakage or distortion, since the force is applied at their most resilient end, and the pull of the springs upon the hammer-arm occurs in the horizontal direction and upward toward the hammer-head, so that there is the least possible liability to friction in the bearings of the hammer. For these reasons the hammer works easily and accurately and is also cheaper to make and more durable in use than treadle-hammers 'as hitherto employed,

While at the same time giving a more powerful blow.

Havin now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- 1. A treadle-operated hammer, comprising a frame, a swinging hammer mounted thereon, means for varying the striking position of the hammer, embodying a spring located at right angles to the hammer, rear- Wardly of its swinging support, a strap attached to this spring and extending forwardly of such support, a pair of similarly-disposed springs, a connection between one of the latter and the spring first named, fourth and fifth similarly-disposed springs, a connection between the fourth and second springs, an anchoring-link for the fifth spring, and an adjusting device cooperating with said fourth and fifth springs, to effect the raising or lowering of the normal position of the hammer.

2. A treadle-operated hammer, comprising a frame, a swinging hammer mounted thereon, means for varying the striking position of the hammer, embodying a spring located at right angles to the hammer, rearwardly of its swinging support, a strap attached to this spring and extending forwardly of such support, a pair of similarlydisposed springs, a connection between one of the latter and the spring first named, fourth and fifth similarly-disposed springs, a connection between the fourth and second springs, an anchoring-link for the fifth spring, and a shackle and adjusting-screw c0operating with said fourth and fifth springs, to effeet the raising 0r lowering of the normal position of the hammer.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CARL MARTIN NIELSEN.

Witnesses:

ALUeNUs JENSEN, S. RosKJAR. 

